Anchor for drill-steel guides



July 2, 1929. E. J. DowNlNG ET AL 1.719.003

-ANCHOR FOR DRILL STEEL GUIDES Filed Jan. l5, 1927 NNE Patented July 2,1929.

tlblt'lED Sla-.ld

PATENT OFFlCE.

EDWEN J. DOWNNG, BARTON R. SHEETS, AND LORENZO CROF'I, OF DENVER, COLO-RABO, ASSIGNORS, BY MESNE ASSIGNMENTS, TO THE GARDNER-DENVER COMPANY, OFQUNCY, LLNOIS, A CORPORATION OF DELAWARE.

ANCHOR FOR DRLL-STEEL GUIDES.

Application filed January 13, 1927.

The present invention relates to guides or drill steels of the typeshown in the application for patent ot Richard Grillitl'i, Serial No.146,515), filed November 11, 1926. It has been found that the anchoringmeans disclosed in said Grillith application, while ellec-tive to holdthe guide in place, has a wedging action so powerful that it' theinitialihole is close to the edge ot the rock, there is a materialtendency to fracture the rock and sometimes to break oil' the sectionbetween the hole and the side ot the rock tace.

The object ot the present .invention is to provide an anchoring meansthat is adjustable so that the anchoring wedge can be brought against aside wall ot the opening ot suliicient thickness to prevent the abovedifficulty.

ln the accompanying drawings 1T igure 1 is a side elevation of thepreferred embodiment ot the invention,

Figure 2 is a plan view of the same,

Figure 3 is an end elevation.

rlhe body of the guide is designated. 41T, and is provided with a seriesof parallel openings 5 for thereception of the drill steel. A bushing 6is employed that is placed in the diliierent openings in succession asthe drill steel is moved from one to the other, the drill steel beingshown at 7. Passing through one end ol' the body, is an opening 8 toreceive a holding spur 9 secured in place by set screws 10. i

In the opposite end ot the body is formed a vertical guideway 11, inwhich is rotatably and slidably mounted an anchor rod or .stem 11.adapted to engage in the initially drilled hole 12 in the rock. This rodor stem is provided with a longitudinal keyway 13, the lower end ofwhich tapers outwardly, as shown at 11i. rlhe guideway 11 provided in atleast three of its sides with keyways 15. A wedging key 1G is adapted tobe slidably engaged in the keyway 13 and .in any one ot' the heyways 15,depending on the position assumed by the anchor stem when it is rotated.The lower end ot this wedging key is tapered as shown at 17, and whenthe key is driven downwardly, it will wedge securely against the wall ofthe drill holt-i12, thereby fastening the anchor stein in place. Theouter side or edge of the wedge key 16 is provided with a series o'fSerial No. 166,958.

undercut teeth or shoulders 18 adapted to be engaged by a releasingtool, and the end ot the body tis provided in .line with the lieywayswith .recessed ulcrum seats 1%) on which the releasing tool or lever isadapted to rest.

`W ith this c mstruetion, it will bc evident that even though the hole12 is partly closed to the side face of the rock, the body can bedifferently positioned and the anchor stem or rod can be turned so thatthe wedge can be inserted against a portion ot lthe rock havingsuliieient body to withstand the wedging action.

`From the foregoing, it is thought that the construction, operation andmany advantages ol the herein described invention will be apparent tothose skilled in the art, without further description, and it will beunderstood that various changes in the size, shape, proportion and minordetails of construction may be resorted to without departing from thespirit or sacrificing any of the advantages of the invention.

What we claim is:

1. In a rock drill guide, the combination with a body having a guidewayfor a drill steel, of means rotatably mounted in the body and engagingin a drilled hole for positioning the body with a` guideway;V in apredetermined position over the rock to be drilled, and means mounted onand adjustable to dil'lerent positions when the positioning means isrotated for securing raid positioning means in different positionsagainst rotation.

2. In a rook drill guide, the combination with a body having a guidewayilfor a drill steel, of an anchor stem rotatably mounted in the l'iodyand engaging in a drilled hole ior positioning the body with theguideway in a predetermined position over the rock to be drilled, and aclamping wedge that is slidably interlocked with the anchor stem and isadjustable to different positions when the stem is rotated.

3. lu a rock drill guide, the combination with a body having a guidewayfor a drill steel, of an anchor stem rotatably mounted in the body andengaging in a drilled hole for positioning the body with the guideway ina predetermined position over the rock to be drilled, and a clampingwedge that engages the anchor stem and is adjustable to differentpositions when the stem is rotated, said Wedge having a portion adaptedto be engaged by a releasing tool, and said body having diiferentportions adapted to act as fulcrums for a toolV engaging said portion. n

4. In a rook drill guide, the combination With a body having a guidewayfor a drill steel, of an anchor stem capable of sliding and rotatablemovement in the body7 said anchor stem having a longitudinal keyway inone side, and a locking' key slidable in the lzeyWa-y and havingshoulders for engagenient by a releasing tool, and said body havingdifferent portions on different sides of the anchor stem that constitutefulcrums ior Ysuch tool.

5. In a rock drill guide, the combination lwith abody having apluralityof guideways for a drill steeland having a bore at one Vendprovided With a plurality of longitudr and adapted to engage in any ofthe guideways of the bore with which the keyway of the anchor stemalines.

6. In a rock drill guide, the combination with a body having a pluralityof gliideways for a drill steel and having a bore at one end providedwith a plurality of longitudinal leyways and fulcrums seats on differentsides of the bore in line with the keyways,

EDIVIN J. DOWN I N G.

BARTON It. SHEE'IS. LORENZO E. OROFT.

